OK, cycling the tank is tougher than I thought. I really want to get something going in QT...........
Here is where the tank is at.......
I put in 4 ppm of ammonia Sunday and enough Dr. Tim's for 180 gallons (the actual water volume is about 160 from when I filled the tank and sump). It is now reading between 2 and 3 ppm. No sign of any nitrite yet. I calibrated all the apex probes. As of this afternoon, I tested a bunch of parameters and here is what I have (I have been slowly adding sodium bicarbonate to bring the Alk up from a baseline of 5.8):
Temp: 80-81 (to get the bacteria going, per recommendation)
Sal: 35 on the Milwaukee, 34.4 on the apex probe
Alk: 9.7
Ca: 437
Mg: 1410
Phos: 0.00
pH: 7.9 (should wind up higher given there is a decent amount of ammonia in the water right now - at least I hope so)
Ammonia: 2-3 ppm

Nitrite and Nitrate: 0.0

No lighting other than ambient
Restarted the skimmer after 48 hours per the directions for Dr. Tim's.
I moved one of the power heads to the left rear of the tank, aimed slightly upward and am bouncing it off the front wall about 1/3 of the way from the left side. The right power head is pointed toward the back slightly and is glancing off the rear wall immediately behind the tall rock structure. There is not a lot of room back there - the power head is only a few inches away from the rear wall, so it is almost firing down the rear wall. I may need to move the right rock structure to the left a few inches and maybe forward an inch or so to get more angle towards the wall on the pump. That said, I seem to have pretty decent flow (tried air bubbles, no flake food yet) and am no longer getting a big bald spot on the bottom (front center) as I did with the two pumps on the left wall. I even turned up the flow and the sand is pretty stable through mavericks at 50%. I hope I can make these locations work as the power heads are really out of the sight lines.